Herbs of Gold Slippery Elm 400mg helps maintain healthy digestive function. Slippery elm bark contains mucilage, which coats the mucous membranes of the digestive system. Mucilage acts as barrier to the lining of the digestive system, protecting it from stomach acid. Slippery elm bark mucilage has demulcent activity. Demulcents soothe irritation and inflammation of the mucous membranes in the digestive system. Traditionally used to relieve the symptoms of gastritis and heartburn/gastric reflux.